Thank you for selecting Aerospace Aviation360 as your go-to distributor of part number 21048000-01 found under Retainer Disk Valve by United Dynamics Inc. The National Stock Number assigned to this part is 4810012474286, and the Federal Supply Class is 4810 Valves Powered. Our website is owned and operated by ASAP Semiconductor, a leading distributor of aviation and aerospace part numbers like 21048000-01.